Improvement in steam-engine balance-slide valves



m., f 0V. K m 1 -l UJ @sw .f m w 0.2m M l m d a J Z ZP. du.. s Z M UNMSMI. I W 1 V\\ Tl. I d M N @Q Bw W m 7 @anni fetes @anni @una LenersPatent No. 75,598, dated Meret 17, 186s,

inPnoVsMnNT In 'STEAM-ENGINE BALANCE-SLIDE VALVES.

dite tlpnle :infant in in tigen ttiittt'ntnrt mit mating part ffilgtstmt.

To ALL WHoMrr MA1@ coNcEnN; i

Beitknown that I, WALJQEMAR THILnIANr,-ot` Cleveland, in theeounty ofCuyahoga, and State of Ohio, have linvented certainnew and use'fulImprovements in Steam-Valves; and I do hereby declarethat thefollowing'lis a full and complete description of the constructionand'operation of the same, reference being had to theaceompanyingdrawing's, making a part of this specification, in which-Figure 1 isa vertical transverse section. I

Figure 2 is a transverse section.

Figure 31's a topview. Y

Figures 4, 5, and 6 are detached sections, to which reference will `bemade.

y Like letters' of reference, refer to like 'parts' in the views. Y

My invention relates to the construction and arrangement of asteam-valve, so Vthat the pressure of the steam enerted on the top ofthe valve ismet by an equal pressure below, thereby neutralizing the rsteective pressure, of the steamon the valve, so that the said' valve willwork without pressure', hence with greatlyreduced friction. Y i g For afull and proper lunderstanding oi'V the constructionof this valve, andits. operation, a descriptionof the same is as follows, viz z' v l In-g. 1, A representsa section of a steam-cylinder; Bthe valve-seat; CC,the steam-throat; D, indicated by the circular dotted line, theeduetion-pipe,show n also ,in iig".` 3.` 'E, the induction-port3 F, thesteamchest; G, the face of thevalve-seat; H' H,`the induction-portsleading to the 'throats C C', and J the steamvalve, all of which are ormay be constructed in the' ordinary way,with the exception of the valve,which will hereafter be further described. f A

` The usual way, as is well known, of admitting steam to the cylinder,is through the eduction-pipe D into the Vchest F, thenceinto thecylinder. through each port H H', respectively, and exhausting throughtheport E. In this mannerjof using steam a large pressure is exert-eduponthe valve', and being. exertedon one side only, a great amount offriction lis induced thereby, and a consequent rapid wearing of theAvalve and` seat, hence a 'loss-of power.

To avoid these results, steam is admittedunderand into the valve Vto thecylinder, through the usual eduction or exhaust-port E, and made toescape through the'usual eductiomport D, the reverse of the `usual way.lIn order `to accomplishthis I`con'struct a hollow open valve, as.shown'i'n iig. 'GQ .This valve, like the ordinary one, is so made thatit will cover bothports H H/at o nce, and 4thereby close the portsagainstthe admission of steam, as shown in tig. '.l-. K is a cover,under which the val-ve slides, and, as -t'will be seen, extends eitherway shortly beyond the regular ,throwof the valve.

As Vabove said, steam is admitted to the cylinder at thernnder sideofthe `valve, instead of thetop, in the ordinary way. Thus,- l'romtheegzhaust'E, through the port I, into the valve, whichl on "beingmoved from the position shown in iig. 1, to that shown in fig. 4, inwhich it will be seen that the induction-port. Vis partially open beforethe port'H, so that the steam may begin t'o exhaust just before Itakingsteam through port H',

which 'it will do on being'moved to the positionshown in tig. 5,the'steampassing in the direction of the'arrows, andat the same timeexhausting throughport H, around the ends and above the cover K, intothe steam-chest F, from which itjescap'es through the yusual induction(as-*used in the ordinary way) pipe D, to the exhaust con nectedthereto; and so ou the-reverse movement of the valve by theeccentric, areverse'direction will be given to the steam, thus exhausting throughH"into the chest, and taking steam through H, and so on alternately,

as thei piston traverses' the cylinder, 'taking steam through the valve,and` exhausting it on the outside of the same. lThe valve being madehollow, it will be obvious that on the admission of steam the pressurewill be exertedequally upon 4it upward and downward, therefore thepressure being changed from one side of the'valve, und madeto pressalike in opposite directionsgthe 4pressure is .lost by mutual reaction;hence the 'valve will work free 'ot' pressure of any considerableamount. But Vasthe valveis'an open one, and the lopening covered by theplate K, the said plate is thereby exposed toY the' direct pressure ofthe vsteam fromrbelow, and hence would be -forced upward out of place,away from the'valve, if not restrainedl by a corresponding'pressnre fromabove'. Topr'oduee this corresponding pressure,'a pair 'of 'disks orpistons, A', iig. 1, is arranged-upon the top ot' the cover K. Thesedisks or pistons are fitted in e ring or 00111113.13', fig. 2. C arefollouerstterl to each end-ot' the ring, and secured topthe'salme byscrews a, the'ring und followers forming a, kind of stallingbox, inwhich the pistons work steam-tight.

lt will he seen that thetwo pistons do nottouch eich other, there beinga. short space, h, between them, and preserved bj the lugs c, whichprevent the two disks from touching. The upper end of the upper disk orpiston rests ago-inst the under side ofthe chest-cover L, whereas thelower enel of the bottom piston rests upon the vulve-cover K. New, itwill be evident that on admitting stoom into the space b'yhemveen thepistons, the result willbe `to force them away from each other, :ind ifthe area of the face of eeeh of the pistons is equal to lthe :treo ofthe opening in the valve, it will he obvious-that the pressure of steamexerted on the bottom pieton will lie equal to that on thespnoe of thecover. K, over the opening in the valve; hence thepressure heing'equulon both sides of the plate K, it will remain in place. Y Steam isadmitted between thepistons through the holes d cil', thus taking steamdirectlyfrom; the valve at full pressure. .As the face of the'velve and.seat inny weer away, the pistons will. be forced further from eachother,and thereby keep-the plate K at all times close and st enwtight downupon the velven When the valve is in the position shown in iig. l, orpassing from that to the position shown in figs. 4 and 5, the pressureof the steam on the valve in consequence of the wells ol, the ports,will be greatest when the valve is full over the ports; .hence thepressure would be'unequal. In orderto meet this extra pressure steem isadmitted above thevlve into the spaces J', immediately over the'ports,undwheh are of the same aren' as the ports therefor, the steam acting inopposite directions neutralize each other; hence the valve is relievedfrom the pressure alluded to.

What I claim as my improvement, and desire to secure by Letters Patent,is- 1. The ail-rangement of the valve J', plate K, lugs c, and passagesd d', with reference to the cylinder A, substantially as specified.

2. The pistons A', as constructed and arranged in relation to theplateK, suhstnntielly as set forth.

WALDEMAR THILMANY.

